It's not debt if your parents pay for it.
(seriously, look at the income demographics for families of Yale students)
Yale is just one more institution following what I call the "Harvard Model": Instead concentrating on providing the very best education, they instead only allow in people who either VERY rich, or have already demonstrated such above average capacities, that they are pretty much guaranteed to excel in whatever they do.
Then they mostly just let them party.
The super-achievers will tend to find success, and people will point to their Harvard education, and go, 'oooooo!'
Meanwhile, the ones that got in on pure $$ will probably not ever be called on to actually Do anything, so are unlikely damage the illusion with poor performance.